______ we have enough evidence (证据), we can’t win the case

The music, ___ which the active elderly were dancing,sounded a bit familiar ____ me.

___________ there a map and two posters on the wall— Sorry, I don’t know.

The boy ____ off the bike and hurt his leg yesterday.

Did he give you advice on your work yesterday—- Yes. But his advice, as a matter of fact, ______ my difficulty.